U.S. patent number 8,528,879 [Application Number 12/669,661] was granted by the patent office on 2013-09-10 for method and device for producing a high-pressure-tight connection and associated valve cartridge for a solenoid valve.
This patent grant is currently assigned to Robert Bosch GmbH. The grantee listed for this patent is Martin Kirschner, Friedrich Mueller, Guenther Schnalzger. Invention is credited to Martin Kirschner, Friedrich Mueller, Guenther Schnalzger.
United States Patent |
8,528,879 |
Mueller , et al. |
September 10, 2013 |
Method and device for producing a high-pressure-tight connection
and associated valve cartridge for a solenoid valve
Abstract
The invention relates to a method and a device for producing a
high-pressure-tight connection between a pole core and a valve
sleeve of a solenoid valve and to an associated valve cartridge for
a solenoid valve. According to the invention, the pole core is
placed in a two-part compression mold, which comprises a middle die
and an outer die, in such a way that a joining gap is produced
between an inner bore of the outer die and the placed-in pole core.
Subsequently, the pole core is placed against the valve sleeve and
the valve sleeve is inserted into the joining gap. Then, the middle
die and the outer die are pressed simultaneously with the pole core
such that the valve sleeve passes into the joining gap. When a
pressed diameter of the pole core is reached, the valve sleeve
expands and is shaped in the joining gap between a first shaping
edge and a second shaping edge and is joined onto the pole core.
The diameter of the inner bore tapers between the first shaping
edge and the second shaping edge. Application of further force by
the outer die allows the pole core to be pressed deeper into the
valve sleeve, in order to carry out a desired stroke setting for
the movement of an armature by performing the further shaping of
the valve sleeve.
Inventors: |
Mueller; Friedrich (Immenstadt,
DE), Schnalzger; Guenther (Blaichach, DE),
Kirschner; Martin (Blaichach, DE) |
Applicant: |
Name |
City |
State |
Country |
Type |
Mueller; Friedrich
Schnalzger; Guenther
Kirschner; Martin |
Immenstadt
Blaichach
Blaichach |
N/A
N/A
N/A |
DE
DE
DE |
|
|
Assignee: |
Robert Bosch GmbH (Stuttgart,
DE)
|
Family
ID: |
39811519 |
Appl.
No.: |
12/669,661 |
Filed: |
July 3, 2008 |
PCT
Filed: |
July 03, 2008 |
PCT No.: |
PCT/EP2008/058573 |
371(c)(1),(2),(4) Date: |
January 19, 2010 |
PCT
Pub. No.: |
WO2009/013102 |
PCT
Pub. Date: |
January 29, 2009 |
Prior Publication Data
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|
|
|
Document
Identifier |
Publication Date |
|
US 20100187453 A1 |
Jul 29, 2010 |
|
Foreign Application Priority Data
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|
|
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Jul 20, 2007 [DE] |
|
|
10 2007 034 032 |
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Current U.S.
Class: |
251/129.15;
251/129.18; 137/315.03 |
Current CPC
Class: |
F16K
31/06 (20130101); B21D 41/04 (20130101); F16B
17/004 (20130101); B60T 8/3615 (20130101); B23P
11/005 (20130101); B21D 39/04 (20130101); B60T
8/363 (20130101); Y10T 29/49412 (20150115); Y10T
137/5987 (20150401); Y10T 29/53552 (20150115) |
Current International
Class: |
F16K
31/02 (20060101) |
Field of
Search: |
;251/129.03,129.15,129.18 ;137/15.18,315.03 ;303/119.2
;335/278,281,297 ;29/606 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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|
|
|
|
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0143062 |
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May 1985 |
|
EP |
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1647460 |
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Apr 2006 |
|
EP |
|
34169 |
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Jul 1934 |
|
NL |
|
Primary Examiner: Keasel; Eric
Attorney, Agent or Firm: Maginot, Moore & Beck
Claims
The invention claimed is:
1. A valve cartridge for a magnet valve comprising: a pole core and
a valve sleeve, wherein the pole core includes i) a first portion
having a first outer diameter that corresponds to a press-fit outer
diameter, ii) a second portion having a second outer diameter that
is less than the first outer diameter, and iii) a joining portion
interposed between the first portion and the second portion and
having an outer diameter that narrows from the first portion to the
second portion, wherein the first portion of the pole core is
press-fitted into the valve sleeve through an opening in an end
portion of the valve sleeve and the second portion projects out of
the valve sleeve from the opening, wherein the joining portion is
introduced into the valve sleeve along with the first portion,
wherein the valve sleeve is joined to the joining portion of the
pole core, wherein the pole core and the valve sleeve are connected
to one another in high-pressure-proof fashion by a method
comprising the following steps: inserting the pole core in a
two-part press-fitting tool; which tool includes a middle die and
an outer die, so that a joining gap is created between an inner
bore of the outer die and the pole core inserted therein, placing
the pole core against the valve sleeve and introducing the valve
sleeve into the joining gap, simultaneously pressing down the
middle die and the outer die with the pole core, so that the valve
sleeve passes through the joining gap in a working direction,
wherein the valve sleeve on reaching the press-fit diameter of the
first portion of the pole core is widened and reshaped in the
joining gap between a first reshaping edge and a second reshaping
edge and joined to the joining portion of the pole core, and
wherein a diameter of the inner bore narrows between the first
reshaping edge and the second reshaping edge.
2. The valve as defined by claim 1, wherein the separating the
outer die from the middle die when the valve sleeve reaches the
second reshaping edge, and after separation from the outer die, the
middle die switches to be forceless, and the outer die is moved
onward in the working direction in order to join the valve sleeve
further to the pole core.
3. The valve as defined by claim 2, wherein the method further
comprises the step of pressing the pole core more deeply into the
valve sleeve past the outer die by further exertion of force, in
order to make a desired stroke adjustment for an axially movable
armature by means of a continuing reshaping operation of the valve
sleeve.
4. The valve as defined by claim 1, wherein the joining portion has
a tapered outer diameter that tapers downwardly from the first
outer diameter toward the second outer diameter.
5. The valve as defined by claim 1, wherein the valve sleeve
defines a passage having an inner diameter that is widened by the
first portion of the pole core when the first portion of the pole
core is press-fitted into the passage.
6. The valve as defined by claim 5, wherein the valve sleeve is
joined to the pole core by constricting the end portion of the
valve sleeve around the joining portion of the pole core such that
the inner diameter of the end portion of the valve sleeve narrows
toward the opening.
7. The valve as defined by claim 1, wherein the end portion of the
valve sleeve has an introduction chamfer.
Description
CROSS-REFERENCE TO RELATED APPLICATION
This application is a 35 USC 371 application of PCT/EP2008/058573
filed on Jul. 3, 2008.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a method and a device for producing a
high-pressure-tight connection between a pole core and valve sleeve
of a magnet valve, and to an associated valve cartridge for a
magnet valve.
2. Description of the Prior Art
A valve cartridge for a conventional magnet valve, in particular
for a hydraulic unit that is used for instance in an anti-lock
brake system (ABS) or traction control system (TC system) or
electronic stability program system (ESP system), is shown in FIG.
1. As can be seen from FIG. 1, the valve cartridge for the
conventional magnet valve includes a pole core 1, a valve sleeve 3,
and an armature 2 that is movable inside the valve sleeve by a
magnetic flux, introduced by a magnet unit, not shown, axially
counter to the force of a restoring spring 5 in the direction of
the pole core 1 via an air gap 6. In the production of the valve
cartridge for the conventional magnet valve, the pole core 1 is
first pre-press-fitted into the valve sleeve 3. Next, in a
different assembly station, iterative adjustment of the armature
stroke is performed by further press-fitting introduction of the
pole core 1 into the valve sleeve 3, until the desired armature
stroke is reached. Next, in a further assembly station, the pole
core 1 is solidly connected to the valve sleeve 3 by a sealing weld
seam 4, the sealing weld seam 4 being produced for instance by
laser welding. By means of the sealing weld seam 4, the valve
cartridge is sealed off hydraulically from the atmosphere. However,
in terms of setup, maintenance, repair and monitoring, laser welds
are vulnerable to mistakes and are cost-intensive.
ADVANTAGES AND SUMMARY OF THE INVENTION
The method according to the invention for producing a
high-pressure-tight connection between a pole core and a valve
sleeve of a magnet valve has the advantage over the prior art that
the assembly flow for a valve cartridge can be made simpler and
more economical by omitting laser welding. By inserting the pole
core into a two-part press-fitting tool, which includes a middle
die and an outer die, so that between an inner bore of the outer
die and the inserted pole core a joining gap is created, and by
placing the pole core against the valve sleeve and introducing the
valve sleeve into the joining gap and simultaneously pressing down
the middle die and the outer die with the pole core so that the
valve sleeve passes through the joining gap, the pre-press-fitting
and the sealing off from outside can be accomplished in one
operation in one assembly station. When a press-fit diameter of the
pole core is reached, the valve sleeve is widened and is reshaped
in the joining gap between a first reshaping edge and a second
reshaping edge, between which the diameter of the inner bore
narrows, and is joined to the pole core, creating a
high-pressure-tight connection between the pole core and the valve
sleeve.
The device according to the invention for producing a
high-pressure-tight connection between a pole core and a valve
sleeve of a magnet valve has a two-part press-fitting tool, which
includes a middle die and an outer die. The press-fitting tool is
embodied such that between an inner bore of the outer die and the
pole core inserted into the press-fitting tool, a joining gap is
embodied which is traversed in the course of assembly by the valve
sleeve. The inner bore of the outer die has a first reshaping edge
and a second reshaping edge, between which the diameter of the
inner bore narrows. The press-fitting tool presses the pole core
into the valve sleeve by simultaneous pressing down of the middle
die and the outer die, in order to reshape the valve sleeve in the
joining gap between the first reshaping edge and the second
reshaping edge and to join it to the pole core, creating a
high-pressure-tight connection between the pole core and the valve
sleeve.
The valve cartridge according to the invention has a
high-pressure-tight connection between a pole core and a valve
sleeve of a magnet valve; this connection is produced by
press-fitting the pole core into the valve sleeve and then joining
the valve sleeve to the pole core.
The high-pressure-tight connection according to the invention
between the pole core and the valve sleeve is produced without
expensive laser welding, in one assembly station. By means of the
connection according to the invention, the pole core is held in its
position, withstanding the internal pressure that is introduced
into the magnet valve during its operation as intended. Moreover,
the connection according to the invention takes on the function of
sealing off from the atmosphere.
It is especially advantageous that the outer die is separated from
the middle die when the valve sleeve reaches the second reshaping
edge, and after being separated from the outer die the middle die
is switched to be forceless, and the outer die is moved onward in
the previous working direction in order to join the valve sleeve
further to the pole core. Because of the forceless middle die, the
position of the pole core remains essentially unchanged, while the
valve sleeve continues to be shaped to conform to the outer shape
of the pole core.
In a feature of the method of the invention, the pole core is
pressed more deeply into the valve sleeve past the outer die by
further exertion of force, in order to make a desired stroke
adjustment for an axially movable armature by means of the
continuing reshaping operation of the valve sleeve. As a result, by
the method of the invention, the stroke adjusting operation can be
performed in the same assembly station as well, thus advantageously
further simplifying the assembly process.
In a feature of the device of the invention, the pole core has a
press-fit diameter, which widens the valve sleeve before reaching
the first reshaping edge. The valve sleeve has an introduction
chamfer, which facilitates introducing the valve sleeve into the
joining gap. Furthermore, the press-fitting tool is embodied such
that the outer die can be separated from the middle die during the
connection operation. As a result, it is advantageously possible
with the device of the invention also to perform the stroke
adjustment of the armature guided movably in the valve sleeve.
Advantageous embodiments of the invention, described below, as well
as the conventional exemplary embodiments described above for the
sake of better comprehension of the these embodiments of the
invention, are shown in the drawings. In the drawings, the same
reference numerals identify components and elements that perform
the same or analogous functions.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a schematic sectional view of a conventional valve
cartridge.
FIGS. 2 through 9 show various states during the method according
to the invention for producing a high-pressure-tight connection
between a pole core and a valve sleeve of a magnet valve.
DESCRIPTION OF THE PREFERRED EMBODIMENT
As can be seen from FIGS. 2 through 9, a device for producing a
high-pressure-tight connection between a pole core 11 and a valve
sleeve 13 of a magnet valve has, as a component essential to the
invention, a two-part press-fitting tool 20, which includes a
middle die 21 and an outer die 22; the press-fitting tool 20 is
embodied such that between an inner bore 22.1 of the outer die 22
and the pole core 11 inserted into the press-fitting tool 20, a
joining gap 25 is embodied, which is traversed by the valve sleeve
13 in the course of the assembly. As can also be seen from FIGS. 2
through 9, the inner bore 22.1 of the outer die 22 has a first
reshaping edge 23 and a second reshaping edge 24, between which the
diameter of the inner bore 22.1 narrows. Furthermore, the pole core
11 has a press-fit diameter 11.1, by means of which the valve
sleeve 13 is widened during the assembly operation.
FIG. 2 shows the press-fitting tool 20 after a first method step,
in which the pole core 11 is inserted into the two-part
press-fitting tool 20. The pole core 11 is inserted into the
press-fitting tool 20 in such a way that the joining gap 25 is
created between the inner bore 22.1 of the outer die 22 and the
inserted pole core 11. Furthermore in FIG. 2, the pole core 11 is
placed against the valve sleeve 13, and the valve sleeve 13 has an
introduction chamfer 13.1, by way of which the valve sleeve 13 can
be more easily introduced into the joining gap 25.
FIGS. 3 and 4 show the press-fitting tool 20 after the introduction
of the valve sleeve 13 into the joining gap 25; the valve sleeve 13
is introduced into the joining gap 25 by simultaneous pressing down
of the middle die 21 and the outer die 22 along with the pole core
11 in the direction of the arrow and passes through this gap.
FIG. 5 shows the press-fitting tool 20 after the press-fit diameter
11.1 of the pole core 11 is reached, and the valve sleeve 13
overcomes the press-fit diameter 11.1 by means of widening. Once
the first reshaping edge 23 is reached, the actual reshaping
process of the valve sleeve 13 begins.
As can be seen from FIGS. 6 and 7, the valve sleeve 13 is reshaped
in the joining gap 25 between the first reshaping edge 23 and the
second reshaping edge 24 and is joined to the pole core 11.
As can be seen from FIG. 8, the outer die 22 is separated from the
middle die 21 when the valve sleeve 13 reaches the second reshaping
edge 24. After the separation from the outer die 22, the middle die
21 is switched to be forceless, and the outer die 22 takes on the
further work of joining the valve sleeve 13 to the pole core 11 by
being moved onward in the previous working direction, indicated by
arrows, in order to further join the valve sleeve 13 to the pole
core 11. During this operation, the position of the pole core 11
remains essentially unchanged.
For adjusting a desired armature stroke, the pole core 11 can be
pressed more deeply in the direction of the arrow into the valve
sleeve 13, as seen in FIG. 9, by means of a further introduction of
force by the outer die 22, which is moved in the direction of the
arrow. The force introduced by the outer die 22 acts via the valve
sleeve 13 on the pole core 11, which via a simultaneous, further
reshaping operation of the valve sleeve 13 is pressed farther into
the valve sleeve 13, so that by that means the adjustment of the
armature stroke can be effected.
By means of the method and device according to the invention,
without expensive laser welding, a valve cartridge for a magnet
valve can be produced whose pole core and valve sleeve are
connected to one another in high-pressure-proof fashion.
Furthermore, the invention advantageously makes it possible to
press-fit the pole core in, to adjust the armature stroke, and to
provide sealing from the outside in a single operation in one
assembly station. The invention thus takes on the stroke adjusting
process, the retention function of the pole core relative to the
operationally dictated internal pressure, and the sealing and
retention function that in a conventional magnet valve have been
performed by a laser welded seam between the pole core and the
valve sleeve.
The foregoing relates to the preferred exemplary embodiment of the
invention, it being understood that other variants and embodiments
thereof are possible within the spirit and scope of the invention,
the latter being defined by the appended claims.
* * * * *